X h hub-boring machine



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HUB BORING MAGHlNE. l No. 274,470. Y Patented Mar. 27,1883.

7/2272641 Www/W PATENT erica.

JOHN T. DETTERER, OF WTILLSHIRE, OHlO.

HUB-Bonino MACHINE.

SPECIFICATION forming To all whom -it may' concern Be it known that I,JOHN T. Barranca, a citizen of the United States, residing at Willshire,in the county ot' Van Wert and State of Ohio, have invented certain newand useful Improvements in HuuBoringMachines; and Ido hereby declare thefollowing to he afull, clear, and exact description otthe invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters or iig'res of reference marked thereon, which form a partof this specification. Y

1n the accompanying drawings, Figure l is an elevation of the apparatus.Fig. 2 is a top plan view of the same. Fig. 3 is a like view, the chuckandadjusting-sleeve being removed. Fig. 4 is a section on line an .n ofFig. 1, and Fig. 5 is a perspective `View ofthe cutterhead and cutters.

Like letters ot reference indicate like parts in the above-describediigures of drawings.

The object ot my invention is to provide means for accurately boring orboxing hubs, and for boring holes or' varying diameter, or

for boring -holes that aretapering from end toV end, or that graduallyincrease in diameter from one end of the hub to a point near the opposite end, and are of uniform diameter from the latter point to theopposite end of the hub.

The invention has for its further object to provide means whereby aclean cutand smooth here is obtained with less power than is usuallyrequired in Stich machines. y

To these ends the invention consists in the construction and combinationof devices, substantiall y as hereinafter fully described.

In the drawings, F indicates the cutterframe, composed of cross-barsj'j"and longitudinal slotted guide-bars F F'. The guidebars F F' areprovided at opposite ends with screw-threaded lugs or tenons ffz, bymeans of which and the nuts N N thesaidguide-bars are secured to thecross-hars.

In order toadapt the apparatus to eut a hole of any desired diameter,theguide-hars F F' are madeadjustahle laterally on the cross-bars ff',which latter are provided with slots s s, through which the tenons ofthe guide-bars F pass, so that on loosening the nuts n the said part ofLetters Patent No. 274,470, dated March. 27', 1883.

` Application iled January 23, 1883. No model.)

hars may be moved in and out on the crossbars to adapt the cutters tocut a hole of the desired diameter.

R is a screw-,threaded rod, that serves to move or feed the cutter-headand cutters along the guide-bars. The rod is centered in a mandrel oractuating-rod, M, that serves to rotate the cutter-frame and cutters. Tothis end the upper cross-har, j', has a central screw-threaded aperture,into which screws the operatingrod orfmandrel M, its lower end having aconical seat for the reception ot the conical bearing formed on theupper end ot the screw-rod R, said rod passing loosely through a centralopeningin the lower cross-bar, f. lt is obvious that if the rod Misrotated,either by pulley and belt from a suitable motor or by handthrough the medium of a crank or the handle h, the frame will rotatewith it, while the screwrod R will remain stationary.

The cutter-head H consists of a square block, in the opposite sides ofwhich are formed dovetailed or other grooves g, for the reception ot'the shanhs c of the cutters C. The cuttingedge 2 ofthese cutters isslightly rounded and made to incline inwardly from the cuttingpoint l tothe enlarged bearingsurface c ot' the shank, the cutter being broadestat its f outer horizontal edge, 3, said edge being also made to inclinerearwardly from the cuttingpoint l. By means ot' this construction thecutters will cut across the grain of the woodthat is to say, they willcut nearly at right angles to the grain-and not only make a clean eutand smooth bore, but it will also require much less power to operate thecutters.

The shank c of the cutters C' have a flat bearing-surface, c', providedwith an aperture for the reception of a set-screw or equivalent device,such as a holt, B, and nut n, said bolts passing loosely through theslots S of the guide-bars F', and serve to guide the cutters along theslots. The shank c of the cutters C lis dovet'ailed'and fits into thelike groove g of the cutter-head, wherein it is held against lateralmotion, said cutters heilig held against bearing for the chuck D, and Kis a tightening-nut, that serves to tighten up the chuck D'.

When the hub is properly centered on the apparatus, as shown in Fig. 1,the cutter-frame may be rotated by hand and the hole in the hub reamedout to the proper diameter or taper; or the apparatus as constituted maybe mounted in suitable supports and the cutterframe rotated by hand orother suitable power.

If it is desired to bore a hole of uniform diameter, a cutter-framehaving parallel slotted guide-bars is employed, and for boring holes ot'graduallyincreasing diameter a cutterl'rame having straight guide-barsarranged accordingly is employed.

As shown in Fig. I of the drawings, the apparatus is adapted to ream onta hole ot' uuil'orm diameter for a portion of the length of the hub A,and from that point said hole is of a uniform taper to the opposite endof said hub A. To produce such a hole the side bars of the frame and theguide-slots therein are ot' the desired form, said bars and slots beingparallel to each -other for acertaiu distance oi' their length, as atf3, from which point to thc cross-barf the bars and slots graduallyapproach each other.

Having now described my invention, what I claim isl. In a hub-boringmachine, a rotating cutter-frame composed ot' guide-bars for guiding thecutters, and cross-bars, with which said guidefbars are connected and ouwhich they are laterally adjustable, in combination with a screw-rod andadjustable cutters having a combined rotary and rectilinear movement onsaid rod with and along said frame, substautially as and for thepurposes specied.

2. In a hub-boring machine, the combination ot` screw-rod and arotating' cutter-frame with a cutter-head andcutters having a combinedrotary and rectilinear movement with and along said frame on saidscrew-rod, substantially as and for the purposes specified.

3. In a hub-boring machine, the combina tion of an eXpansiblecutter-frame, correspondn ingly adjustable cutters, a screw-feed forimparting rectilinear motion to the cutters along the frame, and means,substantially such as described, for rotating the cutter-frame andcutters, substantially as and for the purposes specified.

4L. The combination, in a hub-boring machine, With the cutter-frame F,composed of the slotted side bars, F F', and slotted crossbars fj", thecutter-head I-I, and cutters C, adj ustable thereon, of the screw-rodIt, operating-rod M, and chucks D D', substantially as described, forthe purposes specified.

5. The combination of the slotted lside bars, F', of the frame F and therod R with the cutter-head I1, having dovetailed grooves g, the cuttersC, having dovetailed shanks, and the set-screws or bolts B,substantially as described, for the purposes specified.

6. The combination, with the frame F, the cutterhead and cutters, thechucks D D', and rods It M, ot' the adjustable collar E and nut K, allarranged for co-operation substantial] y as and for the purposesspecified.

7.'The frame F, composed of side bars, F', having slots S and tenons f2,the cross-bars ff', having slots s, and the nuts N, in combination withthe rod It, the cutter-head I'I, hav ing dovetailed grooves g, thecutters (l, having dovctailed shanks, and the boltsB and Witnesses J. H.Sins, lsRAEL REMPP.

